Matti Williams joined Warriors ahead of the 2016/17 season.
The hooker made his Club debut away at Leicester Tigers in October 2016 before going on to make seven appearances during the campaign.
Born in East London, South Africa, Williams started off as a flanker before switching to hooker.
He moved to Northampton Saints in 2013, where he learnt his trade alongside current England captain Dylan Hartley.
Known as a quick runner and strong in the loose, Williams soon made his first-team debut for Northampton against Gloucester Rugby in the LV=Cup.
A broken leg on his Aviva Premiership debut against London Irish cut short his first season at the club, but the hooker returned to action in 2014/15 and went on to make seven top-flight appearances during his time at Franklin's Gardens.